X-Ray Diffraction Analysis and Magnetic Properties of Pr-Fe-B HDDR Powders and Magnets |
| Journal |
Materials Science Forum (Volumes 591 - 593) |
| Volume |
Advanced Powder Technology VI |
| Edited by |
Lucio Salgado and Francisco Ambrozio Filho |
| Pages |
42-47 |
| DOI |
10.4028/www.scientific.net/MSF.591-593.42 |
| Online since |
August, 2008 |
| Authors |
S.C. Silva,
J.H. Duvaizem,
L.G. Martinez,
M.T.D. Orlando,
R.N. Faria,
H. Takiishi
|
| Keywords |
HDDR Powder, Pr-Fe-B Magnet, X-Ray Diffraction Analysis |
| Abstract |
Fine magnetic powder has been produced using the hydrogenation
disproportionation desorption and recombination (HDDR) process. The first goal of this work
involved an investigation of a range of disproportionation/desorption temperatures between
800 and 900°C with the purpose of optimizing the HDDR treatment for a Pr14Fe80B6 alloy.
The cast alloy was annealed at 1100°C for 20 hours for homogenization. The optimum
disproportionation temperature for achieving high anisotropy was 820°C. The influence of the
reaction temperature on the microstructure and magnetic properties of Pr14Fe80B6 HDDR
powders and magnets has been shown. A second stage of this study involved the
characterization, for each temperature, of the HDDR processed powder using X-ray
diffraction analysis. Samples of the HDDR material have been studied by synchrotron
radiation powder diffraction using the Rietveld method for cell refinement, phase
quantification and crystallite sizes determination. Scanning electron microscopy (SEM) has
also been employed to reveal the morphology of the HDDR powder. |
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